Boiler control



March 12, 1940. H s TURNER 2,192,990

BOILER CONTROL Original Filed June 24, 1956 V; t AJM, INVENTOR.

ATTORNEY.

Patented Mar. 12, 1940 PATENT OFFICE 2,192,990 y BoILEn CONTROL Huberts. Turner, New' York, N. Y.v

Original application June 24, 1936, Serial No. 86,999. Divided and thisapplication January 7, 1938, Serial No. 183,854

4 Claims.

My invention relates to improvements in heating systems wherein a boileris employed for generating the heating medium such as steam, and moreparticularly has reference to and is illustrated in the accompanyingdrawing in its application to a steam boiler, the object being toprevent operation of the boiler without a predetermined level of watertherein and this application is a division of my pending application S.N. 86,999 filed June 24, 1936 and now Patent No. 2,169,077. v

When an automatic heater is used, such as an oil fueled steam or hotwater boiler, the water ,gauge is not always kept under observation thesame as with manually fueled boilers, and many oil burners are notprovided with cut-offs which automatically operate when the waterbecomes low. To overcome this, I have devised a control which willprevent operation of the boiler when a predetermined low water level isreached.

In the accompanying drawing I have illustrated a suitable form ofapparatus in perspective embodying an application of my invention, partsbeing broken away. n

4| and 42 indio-ate two small bellowsY attached to a header 43 and frame43 having pivot |61. Air outlet pipe 44 is connected with bellows 4l,and on each side of the header 43, extending parallel with bellows 4|and 42, is a bifurcated bar 46, 46 connected across at the right end byyoke 46 as shown. Between said bellows is coiled spring 41, 4adjustableby the nut 48, which threadably engages the bar 48' within tube 48passing through chamber 43, and said bar 48 is attached to one end ofsaid spring and the opposite end of said spring 4'! is secured to cable5|. Nuts 49 control the movement of the roller 50 in the slots 59 in bar46, 46', and the ilexible cord or chain 5|, passes over roller 5|) toits anchorage at 5| on the frame 43 as shown.

The water in the boiler also circulates in header 43, being suppliedthrough tube 45 and bellows 42 which are below the water level in theboiler, and as the water in the boiler approaches low water level, thewater in header 43 being parallel therewith and fed therefrom, and beingrelieved of the weight of some of the water in said header, is forcedupwardly by the action of spring 4l pulling on cord 5|, passing overroller 50, and.`

anchored at 5|. Due to the leverage exerted by the projecting bar 46,46', pivoted on stud |01, and corresponding stud on lthe other side, theheader 43 rises, and the left end thereof comes in contact with thelower side of the horizontal arm 23 of angle 23, forcing the latter tothe left,

tripping piece 20 normally resting on lug 22, shutting off the burner,themercury contact tube I9 falling and breaking the circuit to the oilburner motor cr other appliance.

'Ihis lifting of header 43 is exerted, regardless of possible steampressure, as the force is transmitted to stud |04 and its companion onthe other side regardless of the position of these studs in their slots.Whenever the piece 20 is tripped, the burner or other appliance is shutdown and cannot again be started until piece 20 and angle 23 are resetby turning button 2`| clockwise which causes piece 2|) to ride upon thelug 22 of arm 23. This prevents another of the dangers found in ordinariboiler controls; namely, when a lowwater cut-ofi of the iloat valve typeis used, and the water in the boiler reaches the cut-ofi point duringoperation of the burner, the returning condensation waterv in a steamsystem raises the water level sufliciently to raise the float, whichstarts the burner again, which is quickly stopped when the Ireturnedwater has again vaporized. These frequent stoppings and startings, whenthe water level is low, seriously overheat the boiler and can causedamage thereto. In my invention, not only is this prevented, but theburner cannot be restarted without rst bringing the boiler water up toits proper level, as the upraised header 43 prevents the upper varm 23and its lug 22 from taking the normal position.

To cut o steam, upon its excessive rise of pressure, it expands bellows4| andl 42, thereby forcing chamber 43 leftwardly upon its trunnions|64, along slots in the ends of bars 46, 46', until said chamber strikesbutton |66 on lever 2S, pivoted upon shaft 2l, thus again releasingmember 26 from lug 22, allowing the mercury switch I9 to fall and againcut off the heating element.

Of course it will be understood that various modifications may be madein the construction and arrangement of parts without departing fromhorizontally in response to variation in steam pressure in said boilerand means for effecting vertical movement of said chamber in response tovariation in Water level in said boiler.

3. A device of the character described comprising a substantiallyhorizontal frame pivoted at one end, a chamber slidably connected to theother end of said frame for horizontal movement, means opposing movementof said chamber relative to said frame and tending to rotate said frameto move said chamber upwardly, and tubular expansible means forproviding communication between said chamber and a boiler whereby saidchamber moves horizontally in response to variation in steam pressure insaid boiler and vertical- HUBERT S. TURNER.

